Cling/no cling-slip stretch wrap film

Abstract

A stretch wrap film having one-sided cling of a thermoplastic A/B layer film structure wherein layer A in its stretched condition has a comparatively high cling force to layer B and layer B has at least substantially no cling force to a layer of itself and has a slide property when layer B is in contact with a layer of itself with relative motion therebetween and the surface of layer B presents sufficient area of an organic polymer which of its very nature causes the no cling force and the slide property.

What is claimed is: 
     
       1. In a stretch wrap film having one-sided cling comprising a thermoplastic A/B layer film structure where, with the surfaces of A/B in their stretched condition, the A surface has a comparatively high cling force to the surface of B and the surface of B has no cling force to itself and has a slide property when the surface of B is in contact with itself with relative motion therebetween, the improvement comprising wherein the surface of B presents at least a sufficient area of another thermoplastic organic polymer of a member selected from the group consisting of a polyamide and a polyfluoro-olefin which of its very nature causes said no cling force and said slide property. 
     
     
       2. The film of claim 1 wherein said another organic polymer is a polyamide. 
     
     
       3. The film of claim 2 wherein said polyamide is present in said B layer in from 0.1% to 100% by weight. 
     
     
       4. The film of claim 2 wherein said polyamide is a nylon. 
     
     
       5. The film of claim 4 wherein said layer A and layer B comprise a polyolefin. 
     
     
       6. The film of claim 5 wherein said polyolefin is generically polyethylene. 
     
     
       7. The film of claim 6 wherein said polyethylene is a copolymer of ethylene and a C 4  -C 10  alpha olefin. 
     
     
       8. The film of claim 1 wherein said another organic polymer is a polyfluoro-olefin. 
     
     
       9. The film of claim 8 wherein said polyfluoro-olefin is present in said B layer in from 0.1% to 100% by weight. 
     
     
       10. The film of claim 8 wherein said layer A and layer B comprise a polyolefin. 
     
     
       11. The film of claim 10 wherein said polyolefin is generically polyethylene. 
     
     
       12. The film of claim 11 wherein said polyethylene is a copolymer of ethylene and a C 4  -C 10  alpha olefin.